Whatman QM-A

These quartz filters combine an exceptionally high flow rate with a high particle retention efficiency rate. Made of ultra-pure quartz (SiO2) microfibers, they are suitable for exacting air pollution monitoring, especially critical analyses and trace level determinations, atomic absorption spectroscopy and flame emission spectrometry. Contain virtually no alkaline earth metals. Particle retention efficiency: 99.999% for 0.6 µm particles at 5 cm/sec. F.V.